Question

The potential difference required to pass a current 0.2 A in a wire of resistance 20ohm is _________.
i)100 V
ii) 4 V
iii) 0.01 V
iv) 40 V

Answer 1

according to Ohm's law
V=R×I
V is the potential difference
R is the resistance
I is the current through resistance.

here R= 20 ohm
I= 0.2 A

so V= 20× 0.2
= 4 volt
option (ii) is correct

Answer 2

V=IR

I=0.2A. R=20 ohm

V=0.2* 20

V=4.0. V=4v